63 lines
935 B
Plaintext
63 lines
935 B
Plaintext
|
.TH EXP 2
|
||
|
|
.SH NAME
|
||
|
|
exp, log, log10, pow, pow10, sqrt \- exponential, logarithm, power, square root
|
||
|
|
.SH SYNOPSIS
|
||
|
|
.B #include <u.h>
|
||
|
|
.br
|
||
|
|
.B #include <libc.h>
|
||
|
|
.PP
|
||
|
|
.nf
|
||
|
|
.B
|
||
|
|
double exp(double x)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
double log(double x)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
double log10(double x)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
double pow(double x, double y)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
double pow10(int n)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
double sqrt(double x)
|
||
|
|
.fi
|
||
|
|
.SH DESCRIPTION
|
||
|
|
.I Exp
|
||
|
|
returns the exponential function of
|
||
|
|
.IR x .
|
||
|
|
.PP
|
||
|
|
.I Log
|
||
|
|
returns the natural logarithm of
|
||
|
|
.IR x ;
|
||
|
|
.I log10
|
||
|
|
returns the base 10 logarithm.
|
||
|
|
.PP
|
||
|
|
.I Pow
|
||
|
|
returns
|
||
|
|
.if t .I x\u\s8y\s10\d
|
||
|
|
.if n x^y,
|
||
|
|
and
|
||
|
|
.I pow10
|
||
|
|
returns
|
||
|
|
.if t .I 10\u\s8n\s10\d
|
||
|
|
.if n 10^n
|
||
|
|
as a double.
|
||
|
|
.PP
|
||
|
|
.I Sqrt
|
||
|
|
returns the square root of
|
||
|
|
.IR x .
|
||
|
|
.SH SOURCE
|
||
|
|
All these routines have portable C implementations in
|
||
|
|
.BR /sys/src/libc/port .
|
||
|
|
Most also have machine-dependent implementations, written either in assembler
|
||
|
|
or C, in
|
||
|
|
.BR /sys/src/libc/$objtype .
|
||
|
|
.SH SEE ALSO
|
||
|
|
.IR hypot (2),
|
||
|
|
.IR sinh (2),
|
||
|
|
.IR intro (2)
|